<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .test{
            position: absolute;
            left: 178px;
            top: 100px;
            width: 100px;
            height: 100px;
            background: #ffffffa3;
            backdrop-filter: blur(1px);
        }
            
    </style>
</head>
<body>
    <img src="https://img2.sycdn.imooc.com/5b1b7b8300012ca708040602.jpg" />
    <div class="test">
        <div>看看模糊不</div>
    </div>
</body>
</html>